#' PHREEQC keywords
#'
#' Commands that signify the beginning of a PHREEQC code block and its type
#'
#' @docType data
#' @usage data(keywords)
#' @format A character vector
#' @references David L. Parkhurst and C.A.J. Appelo: Description of Input
#' and Examples for PHREEQC Version 3--A Computer Program for Speciation,
#' Batch-Reaction, One-Dimensional Transport,
#' and Inverse Geochemical Calculations
#'
#' @source \url{https://wwwbrr.cr.usgs.gov/projects/GWC_coupled/phreeqc/phreeqc3-html/phreeqc3-5.htm#50528257_46140}
#'
#' @examples
#' data(keywords)
#' print(keywords)
#'
"keywords"
